FeaturesComparison of Children and Adults During ExerciseSkinner, James S. Ph.D., FACSMAuthor Information James S. Skinner, Ph.D., FACSM, is a professor emeritus in the Department of Kinesiology at Indiana University. Dr. Skinner served as president of the American College of Sports Medicine (1979–1980) and is a member of the editorial board of ACSM's Health & Fitness Journal®. He has been actively investigating the relationships between exercise, training, and health for more than 55 years and has lectured in English, French, German, and Spanish in 66 countries about these relationships. Disclosure:The author declares no conflict of interest and does not have any financial disclosures. ACSM's Health & Fitness Journal: 7/8 2021 - Volume 25 - Issue 4 - p 29-32 doi: 10.1249/FIT.0000000000000686 Buy Metrics AbstractIn Brief Apply It! After reading this article, the fitness professional will better understand the following: • How children respond to different types of exercise •The effects of growth and maturation on these responses •What types of exercise children will do when they are active Because of body size, some responses of children to exercise are quantitatively different from those of adults. The responses of children and adults to some types of exercise are similar. The different responses of children during high-intensity exercise lasting 30 to 120 seconds, during prolonged endurance exercise, and in hot or cold environments are associated with biological maturation, i.e., they diminish during the stages of puberty. Copyright © 2021 by American College of Sports Medicine.